(CNN) - Republican presidential candidate Mitt Romney on Sunday responded to questions about his ability to connect with voters, standing by his financial success but acknowledging he also had some flaws.
"You know, I can't be perfect," Romney said on "Fox News Sunday." "I just am who I am."
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The former Massachusetts governor made headlines Friday when he casually mentioned in a Detroit speech that he drives two cars and his wife drives "a couple of Cadillacs."
A campaign spokesman said Ann Romney owns two Cadillac SRXs kept at different homes. The 2012 SRX model sells for between $35,000 and $49,000.
The candidate's wealth - Romney's income was $42.7 million over the last two years - has been the focal point of criticism in terms of his ability to appeal to working-class voters.
Asked Sunday about his cars and other statements perceived by some as "out of touch," Romney stood by his corporate success.
"If people think that there is something wrong with being successful in America, then they better vote for the other guy, because I've been extraordinarily successful and I want to use that success and that know-how to help the American people," Romney said.
His comments came two days before Romney seeks to win two big primaries in Arizona and his native state of Michigan. Recent polls show the former Massachusetts governor in a heated sprint with rival Rick Santorum to capture both states.
While Romney depicted himself as the underdog in Michigan, the candidate said Sunday he anticipates doing well in the Wolverine State that his father once governed.
"But how long the process goes on, I think it's hard to predict," Romney said. "I'm convinced I'm going to become the nominee, and we'll be willing to take however long it takes to get that job done."
– CNN Political Producer Rachel Streitfeld contributed to this report.